Calculating Furnace Size?

Answer

The best way to calculate a furnace size is to ask a contractor. They are trained in things like this and can ensure your sizing is done properly. The scientific method used is called The manual J load calculation.
Q&A Related to "Calculating Furnace Size?"
1. Use a furnace calculator, such as HVAC Equipment Size Finder, Home Heat Loss Calculator or the Energy Star Furnace Calculator, to determine the amount of BTUs needed for your home
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1. Check a list of recorded values to find the insulation's resistivity. For example, if the cable uses Teflon insulation, note that it has a resistivity of 1 × 10^19 ohm-meters
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1. Measure the length of the ladder with a measuring tape when it is fully closed. This tells you how long the ladder will be when it's being carried by people or atop a work truck.
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1. Place your socked foot on a sheet of 8-by-11-inch paper on the ground. If your foot is too long to fit lengthwise, step on the page diagonally. If your foot is still too long,
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1 Additional Answer
There are many ways to calculate the right furnace size for your house, and it is important that you do so. The most accepted method is the Manual J Load calculation that factors in construction material, insulation levels, windows, and sizes of rooms among other things. The software to do this calculation is available for purchase. If you are replacing an existing furnace you can simply replace it with a model that has the same output BTU.
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